Dude, you are awesome. I followed the part about the followview plugin and it… worked. Almost in my case. Something you might want to add. If you have active SELINUX (as it is in my case) the whole thing is not going to work unless:

My system is CentOS 6.3 and the flow directory there is /var/flow-tools but whatever it is will have to make that change in order to start working.

In order the plugin to be able to be installed have to be changed to

[root@blah var]# ls -Z /usr/share/cacti/plugins
drwxr-xr-x. root root unconfined_u:object_r:httpd_cache_t:s0 flowview

The flow directory to

[root@blah var]# ls -lZ
drwxr-xr-x. flow-tools flow-tools system_u:object_r:httpd_sys_content_t:s0 flow-tools

otherwise there is nothing on the screen.

Again, thank you for all you spent time, researched and wrote down. No one did that or at least I can't find any normal instruction of «how the h*** to install that plugin».

I can read, speak and write in russian, I am just not that good, so I use English. If you don't mind I rather translate your guide in English and post it but it is up to you.